JPH04223858A - Support device for workpiece in lens work machine - Google Patents

Abstract

PURPOSE:To provide a workpiece support device in a lens work machine capable of work in a stabilized state at all times and capable of executing polishing of high accuracy with the lens being supported in a stabilized state and also with the lens being capable of following up to a polishing tool, at the lens working time, by providing the fulcrum of the lens holder which supports the lens at the lower part than the work face. CONSTITUTION:The rear end of the support arm 10 whose tip is formed in a forked type is connected freely and rotatably to the tip of the arm 4 rockable in the upper and lower direction along the lens curved face with a support shaft 3 as a fulcrum 3a, both ends of the rocking arm 13 formed in about U- shape are rockably suspended via pins 11a, 11b, on the tip of the above support arm 10, a freely roatable lens holder 12 fitted with the work face of a lens W being made upward is set up at the inside of the canter part in the longitudinal direction of the above rocking arm 13, and it is composed so that the center point of the work face of this lens holder is positioned at the intersection of the center line Y-Y passing the center of the pin, the center line X-X passing the center of the support arm, and the perpendicular passing the center of the lens.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to a workpiece support device for a lens processing machine, and more particularly to an improvement of a workpiece support device for a lens processing machine that can stably support a lens during lens processing. be.

0002

[Prior Art] In recent years, light, thin, short, and small high-precision optical lenses have been used in a wide variety of products such as small cameras and video cameras. As a result, there is a demand for unmanned lens processing through automation.

[0003] Also, as a high-precision lens polishing method, generally speaking, a high-precision tool plate is transferred onto the lens side, and in order to maintain high precision, reasonable processing pressure and rocking are applied. Machining conditions such as machining movements such as rotation of the tool plate and rotation of the tool plate are required. On the other hand, lenses come in a wide variety of shapes and sizes, and some lenses are stable and easy to process, while others are very unstable, so the demand for smaller lenses is not uniform. Increasingly, there are shapes that are difficult to process physically and difficult to process physically.

Conventionally, a workpiece (lens) support device for a lens processing machine that polishes the surface of a semicircular lens has been designed to polish the curved surface of a lens attached to a lens holder that can swing back and forth and rotate horizontally. Then, a polishing tool attached to the tip of a rotationally driven spindle is brought into pressure contact with the lens to polish the lens. By the way, the work supporting device in the lens processing machine as described above is disclosed in, for example, Japanese Patent Application Laid-open No. 63
As disclosed in Japanese Patent No. 114860, at the tip of a vertically hanging support rod called a kanzashi pin,
The center of the back surface of a lens holder (lens attachment plate) that holds the lens downward through a kanzashi ball is supported in a swingable manner, and the lens held in this lens holder is removed by a polishing tool installed below the lens holder. The lens holder itself is rotated and polished while being pressed against it by a spindle that rotates the lens holder.

[0005]

[Problems to be Solved by the Invention] However, in the conventional workpiece support device as described above, the lens holder that holds the lens swings using the Kanzaki ball as a fulcrum, and the lens holder and lens are used as a polishing tool by the Kanzaki pin. Since the method is used for machining while applying pressure, the center of gravity of the lens support is always at a higher position than the lens machining surface, and the workpiece's swing fulcrum is at a high position far above the machining surface of the workpiece. The support became extremely unstable, and when the polishing tool attached to the tip of the rotating spindle was pressed against the polishing surface of the lens for polishing, the lens holder with the lens attached would fly up from the polishing tool or flap in the left and right directions. There was a problem in that it was difficult to perform highly accurate polishing.

In addition, in lens processing, as shown in FIG. If the distance from 32 to the end of the lens processing surface is L, then L/T=2.2
It is known from experience that unless the above conditions are met, highly accurate machining cannot generally be performed. Therefore, it is ideal that the L/T ratio is close to infinity.

However, in the case of the conventional device in which the fulcrum is located at a high position above the processing surface, L/T=2.
．． There is a physical limit to making lenses that ensure L/T = 2 or more, and those with L/T = 2.2 or less must be attached to a block etc. to ensure L/T = 2.2 or more. However, unlike single-piece processing, extra work such as making blocks and attaching and peeling off the lens is required, and furthermore, making the lens smaller and lighter is difficult to process due to its shape. The problem was that there were too many.

[0008] The present invention was devised by paying attention to such conventional problems, and by providing the pressurizing fulcrum of the lens holder that supports the lens on the same line as the processing surface, the lens can be kept in a stable state. In addition to supporting the lens, it also allows the lens to follow the polishing tool during lens processing.
It is an object of the present invention to provide a workpiece support device for a lens processing machine that can perform processing in a stable state at all times and perform highly accurate polishing processing.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a support having a bifurcated tip at the tip of an arm that can swing vertically along the curved surface of the lens using a support shaft as a fulcrum. The rear ends of the arms are rotatably connected, and both ends of a swinging arm formed in a substantially U-shape are swingably suspended from the tip of the support arm via pins, and the longitudinal direction of the swinging arm is A rotatable lens holder is installed inside the center of the lens with the processed surface facing upward, and the center point of the processed surface of this lens holder is aligned with the center line Y-Y passing through the center of the pin, The gist is that the lens is located at the intersection of the center line XX passing through the center of the support arm and the perpendicular line passing through the center of the lens.

Another gist of the present invention is that a lens pressurizing means is provided at the rear end side of the arm that is vertically swingable about the support shaft.

[0011]

[Operation of the Invention] The present invention is constructed as described above, and the swinging arm for attaching the lens holder is swingably suspended from the support arm whose tip is formed into a bifurcated shape via a pin. The center of gravity of the lens attached to the holder is always located below the processing surface, so the lens can be supported in a stable state, and the processing center position is aligned with the center line Y-Y passing through the center of the pin. Since it is located at the intersection of the center line X-X passing through the center of the support arm and the perpendicular line passing through the center of the lens, processing is stable and the lens can be easily attached and detached, allowing highly accurate processing. This is something that can be done.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a sectional view of a workpiece support device 1 in a lens processing machine embodying the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a front view. An arm 4 is attached that swings in the vertical direction using a support shaft 3 as a fulcrum 3a.
A bifurcated support arm 10 rotatably connected via a shaft 8 and a bearing 9 is provided at the distal end portion 5 of the support arm 10 . A bifurcated support arm 10 connected to the distal end 5 of the arm 4 projects through a cover 7 into a casing 6 in which a lens W is processed.

As shown in FIGS. 2 and 3, at the tip of the support arm 10 are both ends of a swinging arm 13 having a substantially U-shape that supports a lens holder 12 having a concave cross section via pins 11a and 11b. is supported in a rotatably suspended state, and is supported in a so-called tenbin method so that the pressing force by the polishing tool 16 can be finely adjusted and the processing point of the lens W can be lightly traced to the surface of the polishing tool 16. has been done. Further, as shown in FIG. 3, a lens holder 12 is rotatably supported on the longitudinal center of this swing arm 13 via a bearing member 14 and an adapter 15.
2, the lens W is attached with the processed surface facing upward.

The center O of the processed surface of the lens W held by the lens holder 12 is located between the center line YY passing through the centers of the pins 11a and 11b, the arm 4 and the support arm 1.
The center line X-X of lens W is set to intersect with the perpendicular line Z-Z passing through the center O of the lens W. Therefore, the swinging fulcrum of the lens holder 12 is set to
Since the center of gravity supporting the lens W is located below, the lens W is stably supported, and the above-mentioned L/T, which is ideal for lens processing, can be made infinite.

Further, in FIG. 1, reference numeral 16 indicates a polishing tool for polishing the arc-shaped surface of the lens W, and this polishing tool 16 is used to polish the processed surface of the lens W held upward by the lens holder 12 from below. The polishing tool 16 is installed from above to below so as to perform polishing while being pressurized.
installed on. Further, the spindle 18 is provided coaxially with respect to the above-mentioned X and Z axes so that its angle can be adjusted.

The rear end side of the arm 4, which swings vertically about the support shaft 3 as a fulcrum 3a, is provided with a mechanism for raising the distal end side of the arm 4 and pressurizing the lens W against the polishing tool 16. A lifting device 19 such as an air cylinder is connected to a table 27.
The rear end of the arm 4 is provided with a screw 2 at its tip via a fulcrum pin 21.
The lots 22 forming 2a are connected, and this lot 22
is housed in a guide 23 having a concave cross section so as to be able to rise and fall, and a spring 24 is interposed between the rod 22 and the guide 23 and holder 23a, and a lock nut 25 screwed onto the tip of the rod 22 provides a buffering function. It is supported by having Further, 20 is a shock absorber that comes into contact when the rear end side of the arm 4 is lifted upward, and a sensor 26 is attached to the lower part of the rear end of the arm 4.

A crank arm 28 is connected to the connecting portion between the lifting device 19 and the rod 22, and this crank arm 28 is connected to a drive motor 30 via a crankshaft 29.
is connected to. This drive motor 30 swings the arm 4 in the horizontal direction, and the rotation of the drive motor 30 swings the arm 4 in the horizontal direction via the crankshaft 29 and the crank arm 28, thereby causing the lens holder 12 to swing. The polishing process is performed while horizontally swinging the processed surface of the lens W, which is held upward.

Next, the processing method of the present invention having the above structure will be explained. First, the lens W is set upward in the lens holder 12 with the tip 5 of the arm 4 being lowered as shown in FIG.
The lens W is raised to the processing position, that is, the point where the X-X axis, Y-Y axis, and Z-Z axis intersect. A spindle 18 attached to the tip of the spindle head 17
While rotating the polishing tool 16 by rotationally driving the lens W, the lens holder 12 is swung from side to side via the drive motor 30 and crank mechanism, and the processing surface of the lens W is brought into pressure contact to perform the polishing process. At this time, the lens holder 12 that supports the lens W rotates on its own axis with the rotation of the polishing tool 16, and when it moves in the front-back direction, the swing arm 1
3 swings about the pins 11a and 11b as fulcrums, and the support arm 10 is rotatably supported via the shaft 8, so the lens holder 12 swings following the polishing tool 16.

Furthermore, the following three methods of processing and pressurizing are actually possible in the polishing process as described above. first,
In the first processing and pressurizing method, a fulcrum pin 2 is attached to the arm 4.
A gap t1, t2 is provided between the upper and lower parts of the rod 22 which are connected to each other via a guide 23, and the lens W is pressed against the lens holder 12 while the lifting device 19 is in contact with a stroke end or a stopper (not shown). By compressing the spring 24 with a gap t2 provided, the spring 24
Method of applying pressure using a chisel. That is, by appropriately adjusting the amount of compression of the spring 24 using the guide 23, the pressurization can be adjusted.

[0020] Furthermore, the second processing and pressurizing method is
By setting the gap t1 at the top of the lens 2 to zero, the gap t2 also disappears. Therefore, with the lens W in pressure contact with the lens holder 12, the lifting device 19 is adjusted so as not to hit a stroke end or a stopper (not shown). This makes it possible to pressurize the lifting device 19 with air.

Furthermore, in the third processing and pressurizing method, the pressurization can be adjusted using a weight loading method by placing an appropriate weight on the rear end of the arm 4 (not shown) in place of the spring 24 in the first method. becomes. Furthermore, when it is necessary to control the thickness of the lens W, it is possible to stop when the amount of processing reaches a preset dimension by a sensor 26 provided at the lower rear end of the arm 4.

In the present invention, as described above, the lens W is supported from below and processed by applying pressure from above with the polishing tool 16, and the processing center point O of the lens W is
- It is located at the intersection of the X-axis, Y-Y-axis, and Z-Z axis, so
Before and after processing, the lens W can be attached and detached in a stable state, so the operability is greatly improved, the device structure can be simplified and it is economical, and even in the case of automation, it is easy to attach and detach with a robot etc. It is something.

As a result, when polishing the lens W, the lens holder 12 may fly up from the polishing tool 16, or
The lens W is always supported in a stable state without flapping in the left and right directions, and highly accurate polishing can be performed.

[0024]

Effects of the Invention As described above, this invention rotates the rear end of the support arm, which has a bifurcated tip at the tip of the arm that can swing vertically along the lens curved surface using the support shaft as a fulcrum. Both ends of a swinging arm formed in a substantially U-shape are swingably suspended from the tip of the support arm via pins, and the swinging arm is connected to the support arm so as to be swingably connected to each other, and the swinging arm is swingably connected to the tip of the support arm. A rotatable lens holder is installed with the processed surface of the lens facing upward, and the center point of the processed surface of this lens holder passes through the center line Y-Y passing through the center of the pin and the center of the support arm. Since it is configured to be located at the intersection of the center line In addition, during lens processing, the lens holder does not jump up from the polishing tool or flap from side to side as in conventional methods, and the lens attached to the lens holder follows the polishing tool, making the lens always stable. This has the effect of supporting the lens in various conditions.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a workpiece support device in a lens processing machine embodying the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a front view of the workpiece support device.

FIG. 4 is an explanatory diagram of general lens processing.

[Explanation of symbols]

1 Work support device
3 Support shaft 3a Fulcrum
4 Arm
10 Support arm
11a, 11b pin 12 lens holder
13 Swing arm W lens
O Center of processed surface of lens

Claims (2)

[Claims] [Claim 1] The lens is polished by pressing the curved surface of the lens attached to a lens holder that is swingable in the front-rear direction and pivotable in the horizontal direction to a polishing tool attached to the tip of a rotationally driven spindle. In a workpiece support device for a lens processing machine, the rear end of the support arm, whose tip is formed in a bifurcated shape, is rotatably connected to the tip of the arm that can swing vertically along the lens curved surface using the support shaft as a fulcrum. , both ends of a swinging arm formed in a substantially U-shape are swingably suspended from the tip of the support arm via pins, and a lens is mounted inside the longitudinal center of the swinging arm. A rotatable lens holder is installed with the processed surface facing upward, and the center point of the processed surface of this lens holder is aligned with the center line Y-Y passing through the center of the pin and the center line X- passing through the center of the support arm. 1. A workpiece support device for a lens processing machine, characterized in that the workpiece support device is configured to be located at the intersection of X and a perpendicular line passing through the center of the lens. 2. The workpiece support device for a lens processing machine according to claim 1, further comprising a lens pressurizing means provided on the rear end side of the arm that is vertically swingable about the support shaft as a fulcrum.